# Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation

@article{Fumagalli2021OscillationsIT, title={Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation}, author={Jacopo Fumagalli and S'ebastien Renaux-Petel and Lukas T. Witkowski}, journal={Journal of Cosmology and Astroparticle Physics}, year={2021}, volume={2021} }

We identify a characteristic pattern in the scalar-induced stochastic gravitational wave background from particle production during inflation. If particle production is sufficiently efficient, the scalar power spectrum exhibits πͺ(1) oscillations periodic in k, characteristic of a sharp feature, with an exponentially enhanced envelope. We systematically study the properties of the induced spectrum of gravitational waves sourced after inflation and find that this inherits the periodic structureβ¦Β

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## References

SHOWING 1-10 OF 217 REFERENCES

JCAP 11

- 017
- 2019

JCAP 09

- 037
- 2020

Phys

- Rev. Lett. 125, 121301
- 2020

and L

- T. Witkowski,
- 2020

JCAP 05

- 013
- 2019

JHEP 01

- 097
- 2021

NANOGrav), Astrophys

- J. Lett. 905,
- 2020

Phys

- Rev. D 76, 084019
- 2007

Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies

- PhysicsLiving Reviews in Relativity
- 2021

The first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. This white paper outlines the challenges and gains expectedβ¦

Constraints on primordial black holes

- Physics, MedicineReports on progress in physics. Physical Society
- 2021

The constraints on the fraction of the Universe that may have gone into primordial black holes (PBHs) over the mass range 10β5 to 1050 g are updated and even if PBHs make a small contribution to the DM, they could play an important cosmological role and provide a unique probe of the early Universe.